349 lines
15 KiB
C++
349 lines
15 KiB
C++
/*
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* Authored by Alex Hultman, 2018-2019.
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* Intellectual property of third-party.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef UWS_APP_H
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#define UWS_APP_H
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/* An app is a convenience wrapper of some of the most used fuctionalities and allows a
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* builder-pattern kind of init. Apps operate on the implicit thread local Loop */
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#include "HttpContext.h"
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#include "HttpResponse.h"
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#include "WebSocketContext.h"
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#include "WebSocket.h"
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#include "WebSocketExtensions.h"
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#include "WebSocketHandshake.h"
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namespace uWS {
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/* Compress options (really more like PerMessageDeflateOptions) */
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enum CompressOptions {
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/* Compression disabled */
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DISABLED = 0,
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/* We compress using a shared non-sliding window. No added memory usage, worse compression. */
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SHARED_COMPRESSOR = 1,
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/* We compress using a dedicated sliding window. Major memory usage added, better compression of similarly repeated messages. */
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DEDICATED_COMPRESSOR = 2
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};
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template <bool SSL>
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struct TemplatedApp {
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private:
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/* The app always owns at least one http context, but creates websocket contexts on demand */
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HttpContext<SSL> *httpContext;
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std::vector<WebSocketContext<SSL, true> *> webSocketContexts;
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public:
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/* Attaches a "filter" function to track socket connections/disconnections */
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void filter(fu2::unique_function<void(HttpResponse<SSL> *, int)> &&filterHandler) {
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httpContext->filter(std::move(filterHandler));
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}
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/* Publishes a message to all websocket contexts */
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void publish(std::string_view topic, std::string_view message, OpCode opCode, bool compress = false) {
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for (auto *webSocketContext : webSocketContexts) {
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webSocketContext->getExt()->publish(topic, message, opCode, compress);
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}
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}
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~TemplatedApp() {
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/* Let's just put everything here */
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if (httpContext) {
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httpContext->free();
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for (auto *webSocketContext : webSocketContexts) {
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webSocketContext->free();
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}
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}
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}
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/* Disallow copying, only move */
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TemplatedApp(const TemplatedApp &other) = delete;
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TemplatedApp(TemplatedApp &&other) {
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/* Move HttpContext */
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httpContext = other.httpContext;
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other.httpContext = nullptr;
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/* Move webSocketContexts */
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webSocketContexts = std::move(other.webSocketContexts);
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}
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TemplatedApp(us_socket_context_options_t options = {}) {
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httpContext = uWS::HttpContext<SSL>::create(uWS::Loop::get(), options);
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}
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bool constructorFailed() {
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return !httpContext;
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}
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struct WebSocketBehavior {
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CompressOptions compression = DISABLED;
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int maxPayloadLength = 16 * 1024;
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int idleTimeout = 120;
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int maxBackpressure = 1 * 1024 * 1204;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *, HttpRequest *)> open = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *, std::string_view, uWS::OpCode)> message = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> drain = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> ping = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> pong = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *, int, std::string_view)> close = nullptr;
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};
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template <typename UserData>
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TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
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/* Don't compile if alignment rules cannot be satisfied */
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static_assert(alignof(UserData) <= LIBUS_EXT_ALIGNMENT,
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"µWebSockets cannot satisfy UserData alignment requirements. You need to recompile µSockets with LIBUS_EXT_ALIGNMENT adjusted accordingly.");
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/* Every route has its own websocket context with its own behavior and user data type */
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auto *webSocketContext = WebSocketContext<SSL, true>::create(Loop::get(), (us_socket_context_t *) httpContext);
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/* We need to clear this later on */
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webSocketContexts.push_back(webSocketContext);
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/* Quick fix to disable any compression if set */
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#ifdef UWS_NO_ZLIB
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behavior.compression = uWS::DISABLED;
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#endif
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/* If we are the first one to use compression, initialize it */
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if (behavior.compression) {
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LoopData *loopData = (LoopData *) us_loop_ext(us_socket_context_loop(SSL, webSocketContext->getSocketContext()));
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/* Initialize loop's deflate inflate streams */
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if (!loopData->zlibContext) {
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loopData->zlibContext = new ZlibContext;
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loopData->inflationStream = new InflationStream;
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loopData->deflationStream = new DeflationStream;
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}
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}
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/* Copy all handlers */
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webSocketContext->getExt()->messageHandler = std::move(behavior.message);
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webSocketContext->getExt()->drainHandler = std::move(behavior.drain);
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webSocketContext->getExt()->closeHandler = std::move([closeHandler = std::move(behavior.close)](WebSocket<SSL, true> *ws, int code, std::string_view message) mutable {
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closeHandler(ws, code, message);
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/* Destruct user data after returning from close handler */
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((UserData *) ws->getUserData())->~UserData();
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});
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/* Copy settings */
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webSocketContext->getExt()->maxPayloadLength = behavior.maxPayloadLength;
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webSocketContext->getExt()->idleTimeout = behavior.idleTimeout;
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webSocketContext->getExt()->maxBackpressure = behavior.maxBackpressure;
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httpContext->onHttp("get", pattern, [webSocketContext, httpContext = this->httpContext, behavior = std::move(behavior)](auto *res, auto *req) mutable {
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/* If we have this header set, it's a websocket */
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std::string_view secWebSocketKey = req->getHeader("sec-websocket-key");
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if (secWebSocketKey.length() == 24) {
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/* Note: OpenSSL can be used here to speed this up somewhat */
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char secWebSocketAccept[29] = {};
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WebSocketHandshake::generate(secWebSocketKey.data(), secWebSocketAccept);
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res->writeStatus("101 Switching Protocols")
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->writeHeader("Upgrade", "websocket")
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->writeHeader("Connection", "Upgrade")
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->writeHeader("Sec-WebSocket-Accept", secWebSocketAccept);
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/* Select first subprotocol if present */
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std::string_view secWebSocketProtocol = req->getHeader("sec-websocket-protocol");
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if (secWebSocketProtocol.length()) {
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res->writeHeader("Sec-WebSocket-Protocol", secWebSocketProtocol.substr(0, secWebSocketProtocol.find(',')));
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}
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/* Negotiate compression */
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bool perMessageDeflate = false;
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bool slidingDeflateWindow = false;
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if (behavior.compression != DISABLED) {
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std::string_view extensions = req->getHeader("sec-websocket-extensions");
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if (extensions.length()) {
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/* We never support client context takeover (the client cannot compress with a sliding window). */
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int wantedOptions = PERMESSAGE_DEFLATE | CLIENT_NO_CONTEXT_TAKEOVER;
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/* Shared compressor is the default */
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if (behavior.compression == SHARED_COMPRESSOR) {
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/* Disable per-socket compressor */
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wantedOptions |= SERVER_NO_CONTEXT_TAKEOVER;
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}
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/* isServer = true */
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ExtensionsNegotiator<true> extensionsNegotiator(wantedOptions);
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extensionsNegotiator.readOffer(extensions);
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/* Todo: remove these mid string copies */
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std::string offer = extensionsNegotiator.generateOffer();
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if (offer.length()) {
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res->writeHeader("Sec-WebSocket-Extensions", offer);
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}
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/* Did we negotiate permessage-deflate? */
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if (extensionsNegotiator.getNegotiatedOptions() & PERMESSAGE_DEFLATE) {
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perMessageDeflate = true;
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}
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/* Is the server allowed to compress with a sliding window? */
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if (!(extensionsNegotiator.getNegotiatedOptions() & SERVER_NO_CONTEXT_TAKEOVER)) {
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slidingDeflateWindow = true;
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}
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}
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}
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/* This will add our mark */
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res->upgrade();
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/* Move any backpressure */
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std::string backpressure(std::move(((AsyncSocketData<SSL> *) res->getHttpResponseData())->buffer));
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/* Keep any fallback buffer alive until we returned from open event, keeping req valid */
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std::string fallback(std::move(res->getHttpResponseData()->salvageFallbackBuffer()));
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/* Destroy HttpResponseData */
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res->getHttpResponseData()->~HttpResponseData();
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/* Adopting a socket invalidates it, do not rely on it directly to carry any data */
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WebSocket<SSL, true> *webSocket = (WebSocket<SSL, true> *) us_socket_context_adopt_socket(SSL,
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(us_socket_context_t *) webSocketContext, (us_socket_t *) res, sizeof(WebSocketData) + sizeof(UserData));
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/* Update corked socket in case we got a new one (assuming we always are corked in handlers). */
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webSocket->AsyncSocket<SSL>::cork();
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/* Initialize websocket with any moved backpressure intact */
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httpContext->upgradeToWebSocket(
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webSocket->init(perMessageDeflate, slidingDeflateWindow, std::move(backpressure))
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);
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/* Emit open event and start the timeout */
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if (behavior.open) {
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us_socket_timeout(SSL, (us_socket_t *) webSocket, behavior.idleTimeout);
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/* Default construct the UserData right before calling open handler */
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new (webSocket->getUserData()) UserData;
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behavior.open(webSocket, req);
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}
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/* We are going to get uncorked by the Http get return */
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/* We do not need to check for any close or shutdown here as we immediately return from get handler */
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} else {
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/* Tell the router that we did not handle this request */
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req->setYield(true);
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}
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}, true);
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return std::move(*this);
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}
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TemplatedApp &&get(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("get", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&post(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("post", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&options(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("options", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&del(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("delete", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&patch(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("patch", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&put(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("put", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&head(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("head", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&connect(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("connect", pattern, std::move(handler));
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return std::move(*this);
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}
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TemplatedApp &&trace(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("trace", pattern, std::move(handler));
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return std::move(*this);
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}
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/* This one catches any method */
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TemplatedApp &&any(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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httpContext->onHttp("*", pattern, std::move(handler));
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return std::move(*this);
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}
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/* Host, port, callback */
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TemplatedApp &&listen(std::string host, int port, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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if (!host.length()) {
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return listen(port, std::move(handler));
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}
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handler(httpContext->listen(host.c_str(), port, 0));
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return std::move(*this);
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}
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/* Host, port, options, callback */
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TemplatedApp &&listen(std::string host, int port, int options, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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if (!host.length()) {
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return listen(port, options, std::move(handler));
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}
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handler(httpContext->listen(host.c_str(), port, options));
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return std::move(*this);
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}
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/* Port, callback */
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TemplatedApp &&listen(int port, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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handler(httpContext->listen(nullptr, port, 0));
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return std::move(*this);
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}
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/* Port, options, callback */
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TemplatedApp &&listen(int port, int options, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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handler(httpContext->listen(nullptr, port, options));
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return std::move(*this);
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}
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TemplatedApp &&run() {
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uWS::run();
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return std::move(*this);
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}
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};
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typedef TemplatedApp<false> App;
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typedef TemplatedApp<true> SSLApp;
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}
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#endif // UWS_APP_H
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